PERIOD	VALUE
1997	7950
1998	8660
1999	9955
2000	9358
2001	11166
2002	11310
2003	12768
2004	12754
2005	12268
2006	12530
2007	13878
2008	12969
2009	14393
2010	12738
2011	14575
2012	15355
2013	17750
2014	22456
2015	21306
2016	22475
2017	23696
2018	26175
2019	27612
2020	42187